

void main() {
  print("Hello,Dart");

  var name = 'Voy';
  var year = 1991;
  var wieght = 3.7;

  var str = ['1', '2', '3'];

  var images = {
    'tags': ['asturn'],
    'url': '/ddd',
  };

  if (year >= 2001) {
    print('21st century');
  } else if (year >= 1901) {
    print('20th century');
  }

  print(fibonacci(4));
}

// 
int fibonacci(int n) {
  if (n == 0 || n == 1) return n;
  return fibonacci(n - 1) + fibonacci(n - 2);
}